Manufacture of tubes.



O. BRIEDE.

MANUFACTURE OF TUBESx APPLIOATION FILED SEPT.7,1906.

Patented Mar. 2, 1909 Fiill- INVENTOH THE :vnmus PETERS cm, wAsmucraN, nvc.

OTTO BRIEDE, OF BENRATI-I, GERMANY.

MANUFACTURE OF TUBES.

Specification of Letters Patent.

Patented March 2, 1909.

Application filed September 7, 1905. Serial No. 277,396.

T 0 all whom it may concern:

Be it known that I, OTTO BRIEDE, residing at Benrath, in the Province of the Rhine and Kingdom of Prussia, Germany, a citizen of the Kingdom of Prussia and Empire of Ger many, have invented or discovered certain new and useful Improvements in the Manufacture of Tubes, of which improvements the following is a specification.

The object of the present invention is to prevent the adherence of the billet to a mandrel in the production of thin walled tubes by the pushing of one side of the billet away from the mandrel during the reducing and elongating action on the opposite side of the billet.

In the accompanying drawing forming a part of this specification, Figure 1 is a sectional view of a train of rolls embodying my improvement; Fig. 1 is also a sectional view of said rolls but in a plane at an angle of 90 from the section shown in Fig. 1. Fig. 2 illustrates the arrangement of the rolls. Figs. 3 and 4 are detail views illustrating the sizes of the grooves in the rolls relative to the billet operated on and also illustrating the action of the rolls on the billet.

In the practice of my invention a series of stands or pairs A. B. C. of rolls 1 1 2 2 3 3*, etc., arranged for continuous action, i. 6., at such a distance apart that the billet will be caught by one pair of rolls before it is freed from the preceding pair. Alternate rolls are arranged with their axes at an angle, preferably a right angle to the axes of the receding pair of rolls'as shown in Fig. 2. T e rolls of each pair or stand are so mounted in their housings that the points of bearings of the rolls on the billet will not be in a plane passing through the axes of the rolls, but are so arranged, one somewhat in advance of the other that planes passing through the axes of the rolls and at right angles to the line of feed of the billet, will be parallel to each other but will not coincide, as shown in Figs. 1 and 2. One roll of each pair should be arranged in advance of the other roll, to permit of the metal being displaced by the first roll not only along the mandrel but also transverse of the mandrel. By reference to Fig. 1 it will be seen that by the action of the roll 1 which has a bite or bearing on the billet in the rear of the bite or bearing of the roll 1 the billet is not only elongated but also enlarged transversely, and that in consequence of this transverse enlargement the portion of mandrel as indicated at a.

the wall of the billet opposite that on which the roll 1 bears and in the rear of the bite or bearing of the roll 1 is forced away from the The roll 3" which has its axis parallel with the axes of the rolls of the stand or pair A, will operate in the billet at a point diametrically opposite the point of bearing or bite of the roll 1, but farther along the billet, and will produce an elongation and transverse enlargement of the billet. As the roll 3 will prevent an extension of such enlargement forward, the portion of the wall of the billet on the side opposite that acted on by the roll 3 and in front of the roll 3 will be forced out of contact with the mandrel as indicated at a.

While for purposes of illustration the several lateral displacements a, I), 0, etc. of the walls of the billet, are shown in Fig. 1 as occurring along two diametrically opposite sides of the billet and mandrel, the enlargements or displacements b and c effected by the rolls 2 and 2 will be ninety instead of one hundred and eighty degrees from the displacements or enlargements effected by the rolls 1 and 3 as the rolls 2 and 2* have their axes at right angles to the axes of the rolls 1*, 1 and 3?, 3

In order to prevent the formation of fins the rooves in the several rolls are made of a dept 1 greater than half the diameter of the billet at the points where the rolls operate.

In order to prevent excessive springing of the mandrel by reason of the points of bearing or bite of the rolls of each pair being out of line, the points of bite of the rolls of each pair should be separated only sufiiciently to permit of the necessary enlargement and displacement of the walls of the billet.

It will be seen by reference to Figs. 3 and 4 that an oval shape is imparted by the rolls which have their bite or bearing out of line transversely with the bites or bearings of the other rolls, hence it is necessary to bring the pipe to proper shape by a pair of rolls having their axes in a common plane. It is )IG- ferred that this finishin pair of rolls, w iich may be reducing rolls, s 1011l(l form a part of the continuous mill as shown at 5 in Fig. 2.

It is characteristic of my improvement that each of the rolls while producing an elongation of a portion of the wall of the billet at the same time produces such an enlargement and displacement of the billet away from the mandrel, that the elongation and consequent movement along and independent of the mandrel can take place without material friction between the mandrel and billet.

I claim herein as my invention 1. As an improvement in the art of rolling hollow billets on a mandrel, the method herein described which consists in passing a billet longitudinally through a series of rnllsapplying rolling reducing pressure to the billet at only one point in the same plane transverse of the axis of the billet thereby onlarging and elongating the billet, and permit-ting the metal 01'' the billet at points outside that of applied pressure to move away from the maylrel.

2. As an lmprovel'nent in the art of rolling hollow billets on a mandrel, the method herein described which consists in passing a billet longitudinally through a series of rolls applying rolling reducing pressure to the billet at a series of points along the same, no two points of pressure being in the same plane transverse of the axis of the billet and permitting the metal of the billet at points outside those of applied pressure to move away from the mandrel.

3. As an improvement in the art of rolling hollow billets on a mandrel, the method herein described which consists in passing a billet longitudinally through a series of rolls applying rolling reducing pressure to the billet at a series of points along and around the same, no two points of pressure being in the same planes transverse of the billet and permitting the metal of the billet at points outside those of applied pressure to move away from, the mandrel. v

4. As an improvement in the art of rolling hollow billets, the method herein described which consists in passing a billet longitudinally through a series of rolls simultaneously applying rolling reducing pressure to opposite sides of the billet, each point of applied pressure being in a plane transverse of the billet but outside of the plane passing through the other points of pressure and permitting the metal of the billet at points opposite that of applied pressure to move away from the mandrel.

In testimony whereof, I have hereunto set my hand.

- OTTO BRIEDE.

itnesses FRANK HEssENBUoH, WILLIAM ESSENWEIN. 

